I agree with Bryce that it probably doesn't affect Google's perception of the page at all.
However, from a user standpoint an "outdated" copyright could work against you. I see it as a sort of trust signal. I was on a page earlier that said "Copyright 2001" and I just couldn't get over it. If they can't bother to update the date on their site, why would they bother with having me as a customer?
Just something to think about. Great question.